Photometric determination of silica. • Photometric determination as silico-molybdenum blue. in acidic solution dissolved silica and silicates react with ammonium molybdate to form yellow silicomolybdic acid. This is reduced to a blue compound by addition of a reducing agent. • Reaction basis analog to DIN EN ISO 16264-H57. • Type standard test 1-48 • Range: 10 mm cuvettte: 0.1 - 10.0 mg/l SiO2 50 mm cuvette: 0.02 - 3.00 mg/l SiO2; 0.005 - 0.200 mg/l SiO2 • Sufficient for: 250 determinations • Sea water suitability: yes